What is the fourth angle of a cyclic quadrilateral in which three angles are 50°, 130° and 120°?
Explanation:
For a cyclic quadrilateral, the sum of the interior angles is always 360°.
Assume the fourth angle to be ‘x’.
∴ x + 50° + 130° + 120° = 360°
∴ x + 300° = 360°
∴ x = 60°
Hence, option (b).
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